Frame extraction is fast — typically 20-30% of source duration on the standard pipeline. A 5-minute 3GP → BMP bundle finishes in about 1 minute regardless of frame count, because the bottleneck is the BMP encoder, not the demuxer.
我可以在 3GP 视频中特定的时间戳提取框架吗?
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Yes — the advanced option accepts a comma-separated list of timestamps (e.g. `00:01:23,00:05:00,00:10:42`) and produces one BMP file per timestamp. Useful for chapter thumbnails or scene reference shots.
Yes, subject to whatever licence governs the source 3GP content. The format change adds no claim — we add no watermark and claim no licence on the BMP output.